Attachment for party-line telephones.



No. 868,594. PATENTED OCT. 15, 1907. J. H. BLYTHE.

ATTACHMENT FOR PARTY LINE TELEPHONES.

APPLICATION FILED MAY 21. 1906 3 SHEETS-SHEET 1.

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No. 868,594. PATENTBD OGT.15, 1907.

J. H. BLYTHE.

ATTACHMENT FOR PARTY LIN-E TBLEPHONES- APPLIOATION FILED MAY 21. 1906.

3 SHEETS-SHEET 2.

PATENTED OCT. 15, 1907.

' J. H. BLYTHE.

ATTACHMENT FOR PARTY LINE TBLEPHONES.

APPLICATION PILED MAY 21, 1906.

3 SHEETS-SHEET 3.

wwwoowo UNITED [STATES PATENT 0m JAMES H. BLYTHE, OF DENVER,'COLORADO.

ATTACHMENT FOR PARTY-LINE TELEPHONES.

To all whom it may concern:

Be it known that I, JAMES H. BLYTHE, a citizen of the United States,residing in the city and county of Denver and State of Colorado, haveinvented certain new .and useful Improvements in Attachments for Party-Line Telephones; and I' do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use'the same,reference being had to the accompanying drawings, and to the letters andfigures of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in attachments for party linetelephones, my object being to equip the ordinary party line instrumentwith such apparatus that when central rings any telephone of the partyline, all 01' the other telephones will be cut out so that no other bellon the line will ring and no one else having a telephone on the line canhear the conversation carried on through another telephone.-

Heretofore so far as I am aware where party'line telephones are in use,any one whose telephone is on the line may by taking down the receiverof the instrument hear any conversation that is going on through anytelephone of the line. Moreoverwhere the ordi nary party line telephonesare used, the bells of all the telephones ring whene ver central callsany particular telephone.

By virtue of my improved equipment, the operator at the central officeis enabled to cut out all other telephones on the line before ringing upany particular telephone. My improvements do not necessitate the runningof rgt aline wires, the construction being such that it may be att aeimqgto any telephone using only the ordinary wire equipmenti :1;

Having briefly outlined my iifireved construction aswell as the functionit is intended to perform, I will made to the accompanying drawing inwhich is illustrated an embodiment thereof.

In this drawing, Figure l is a side elevation partly in sectionillustrating my improved attachment. The sectional part of this. figuremay be said to be taken on the line 1-1 Fig. 3. Fig. 2 is a view of thesame looking in the opposite direction or a section taken on the line 22Fig. 3 looking in vthe direction of the arrow adjacent said line. Fig. 3=is a top plan view of the instrument. Fig. 4 is a diagrammatic viewshowing a number of tele- -phones with-my improved instrument attached.Fig. 50.

, Fig. 6 is asimilar view of the same device shown in a dif-Specification of Letters Patent.

I Application filed May 21,1906. Serial No. 317,902.

pleted every other telephone is cut out olthecircuit ierent position.Fig. 7 is an end elevation of Fig. 1 look- Patented Oct. 15,1907.

ing in the direction of arrow 7 on the last named figure.

Fig. 8 is an end elevation looking in the opposite direction or in thedirection of arrow 8 in Fig. 2. Fig. 9 is a.

view illustrating a series of wheels 19 carrying contacts 20 differentlyarranged with reference to the contacts 21 for illustrating thearrangement of these wheels when used in connection with a series oftelephones on the same line. From these views it will be understood thatwhen the contact 20 of any wheel is in engagement with the brush 22, 22,the corresponding contacts'20 of all the other telephones will bedisconnected from their corresponding brushes 22, 22. H

The same reference characters indicate the in all the views.

Let the numeral 5 designate a frame 'upon which are mounted twoelectro-mag'nets 6 and 7. I will designate the magnet 6 as theregistering magnet, and the magnet 7 as the releasing magnet. providedwith an armature 8 pivoted at the base of the frame as shown at 9. Tothe upper extremity of this armature is pivotally attached a pawl 10'acting on a ratchet wheel 12 fast on a spindle 13. Connected with thisspindle and coiled around the same is a spring 14 whose extremity remotefrom the'shaft is connected with the frame as shown at 15. Mounted on aspindle 16, journaled in the top frame work 17 is a'locking pawl sameparts The magnet (Sis 18 which also engages the ratchet wheel 12anddooks position of the wheel 19 when none of the party line telephonesis in use, is that shown in Figs. 3 and '5, that is to say with the pin2] engaging the'springs 22 which together may be termed a brush. Whenthis proceed to describe the same in detail reierence beings pin 21 isin this position any telephone on the line is in positionto callcentral. As soon as any one desires connection with any telephone on theline the operator at central by closing the circuit of the-registeringmgnets 6 a given number of times depending upon the v position of thepin 20.0n thev wheel 19, with reference tothe pin 21 of the telephone tobe connected,--is'enabled to bring the required pin 20 into engagementwith the brush 22, 22. When this operation is com since its pin 21 isdisengaged from the brush'22,' 22, and no other pin 20 is in engagementwith the. hmshfl f' tive position.

every wheel is provided with threaded sockets adopted to receive a lmber f-pins corresponding withtlie" ture 8 is actuated sufficiently tomove the ratchet wheel. one tooth by virtue of the pawl 1t), while thepawl- 18 number of telephones on the line, so that the wheels betweenthe pin 20 and the pin 21 of the instrument to I be connected {fortalking purposes. The ratchet wheel '12 is so constructed that everytime it is.moved one tooth, the wheel 19 is moved the distance betweentwo pins, and it will be understood that every time the circuit isclosed with the registering magnet 6, the armalocks the ratchet wheelagainst the reverse movement and insures the closingof thetelephonethrough the brush 22, 22 until the operator-at central wishesto break the connection. After the connected telephone has been used, inorder to restore all the telephones to their normal calling condition orbring the pin 21 of each of my improved attachments, back intoengagement with the brush 22, 22 the operator at central pushes a buttonor otherwise closes the circuit of the electromagnet 7 and its armature23 as it moves to the poles of the magnet by virtue of the electro-magnetic force, acts on a screw pin 24 connected with a depending arm 25made fast to the spindle 16 and disengagcs the locking dog 16 from theratchet wheel 12, when the recoil of the spring 14 returns the pin wheel19 to its-normal position with the pin 21 in engagement with the brush 222, 22. This occurs simultaneously at every telephone on the line thoughat only one of these telephones is the pin 20 of my improved attachmentin engagement with the brush 22, 22. Orin other words all thetelephonesexc'ept one have been completely cut out of the circuit but byclosing the releasing magnet all of them are placed in position forcalling central the same as before the operation'heretofore describedtook place.

' The circuits will be better understood by reference toFig. 4. In thisview the telephones are illustrated and designated 26. In this view lot27 designate the electricsource from one .pole of which leads a wire 28and from the other pole a wire or conductor 29. From thewire' 28 leads abranch wire 30 to a binding post 3].. From this binding post a wire 32leads to a point 33 from wli ich leads a wire B t to the coils of theregistering magne s i while a wire 3 5 leads to the coils of the 4releasing magnetj7. From the magnet 6 a wire 36 reads to a bindiri gpost 37 and fromthis binding post-awire 38 leads tothe ground at. 39.

' The wire 29 may be said to lead to a block 40. An

I adjacent block 41 is adapted to be connected with the block '40 by apush button 42. When this push button is pressed, the contact blocks 40and 41 are electrically connectedand when the pressure is released thetwo blocks are electrically disconnected. From the block I 41 leads awire 43 to the ground at 14.

A wire {i5 leads from the line wire 28 to'the telephone 26, while a wire46 leads from the telephone to a binding post'47 whence a wire 48 leadsto one member of the brush 22, 22; The twomembers 22, 22 of this brushare separated by insulating material 49. A wire 50 .leads from theopposite brush member 22 to a brush 51 wvhosmupper extremity isconnccted with a secohd line, a repetition is therefore unnecessary.

brush 52. The lower extremities of these brushes are separated byinsulating material 53. A brush 54 is normally disconnected at the topfrom the brush 52'while its lower extremity is separated from the brush52 by insulating material 55. branch wire 56 leads from the base of thebrush 55 to the coils of the releasing magnet 7.

Above the contact block 40 is located a similar block 57- which may beconnected with the block 40 by a push button 58. .From the block 57leads a main line wire 59. From this main line wire, leads a branch wire60 to a binding post 61 whence a wire 62 leads to the brush 52. Thewiring is the samefor my improved attachment in connection with everytelephone on the Assuming now that the operatorat central has received acall requiring connection with a telephone on the party line whose pin20 is in the position shown in Fig. 5, this pin in this event beingseparated from the pin 21 on the wheel 19 by eight spaces. Central willnow press the push button 42 eight times causing the wheel 19 to travelin the direction indicated by the arrow 5 in Figs. 5 and 6 until the pin2011's brought into the position shown in Fig. 6, also shown by dottedlines at the attachment connected with the telephone 26 farther to theleft in Fig. 4. Now it is only necessary for the operator at central toclose the signal circuit which is done by pressing the push button 58which would cause the bell of the telephone-26 in question to ring.After the person at this telephone has finished .talking, the operatorfirst presses thepushbutton 42 which energizes the registering magn andthrows the armature 8 and the pawl 10 to the forward posi- 54. Thenwhile still pressing the push button 42-, the push button 58 is pressed.'The pressing of this button energizes the magnet 7, since the currentmay be said tion, bringing the bruslu 52 in contactlivith the brush topass from one pole oi the source 27 through the wire 28, branch wires30, 32 and 35 through the coils of the magnet 7, the wire 56, thebrush54, the brush 52 and the wires 62 and 60 through the main wire 59,through i the contact blocks 57 and 40 to the other pole of the source.The magnet 7 being energized acts on the armature 23 which in movingtoward the poles of the magnet 7, acts on a screw pin 24, and causes thearm 25 to disengage the locking pawl 18 from the ratchet wheel bylifting the same. The operating pawl 10 also being in the forwardposition is raised above the ratchet wheelv 12 sufiiciently to allow thelatter to reverse under the influence of the recoil action of the spring14. This throws all of the pin wheels 19 of the attachments belonging tothe various telephones on the line, back into' the original position orthat shown in Fig. 5 of the drawing. In this event it will beunderstoodthat the pin wheel 19 moves in the direction the reverse oithat indicated by the arrows in Figs. 5 and 6. i

Attention is called to the fact that a contact 8 is: connected with andinsulated from the armature 8 and is bent to cause its free extremity 8topass between the two spring brushes 5.1 and 52, and form an electricalconnection between the two brushes when the armature 12, the contacts 8'is disconnected 11g bzusa 52 is sought 5 1 30 can @he spring k, 4 asheretofore 6 v Aged. EM 1116 diescribezi my invention, What 1 CL. ln :1tezeylmne utulc'nmeut folf party l1" 1 a; cmnblnatlqg with tolc bol sand the czrcuh in ilcll El ;-y are 'lomte of means controllable mm ,thcentral nfilce {or editing q-lwncs out of the c; n then clesing the 'liyn aneously rots;

he circuit and normally engagsu Jana fur sin? l ry contm t pin on I .hrxezrm ce to the'maln cam of any other make-91mm wheel whereb l1 l two whorns are ashamed and.

or restoring the main pins on the maku-u nd-m mk up their norumlpusition comprising an armature pro (led witlru ratchet pawl and akicking pa wLuthe l'qck- 311g pawl buying :1' downwardly projecting 'armwhili is opersi'efi by any :suitablemoims adapted to be attached to thearmature, substantially as described. V

In t nonywhex-eo fi I nL'u: my signamv'e in presence pf circuit-wa ingposition, angl eleciro-mqgnetiq

